One more plagiarism checker that works well from what we could test.
Not super fast (but that can be expected if many sources), but free up to a search of 1000 words, and provides one or more links to the sources and some plagia score.
A metasearch engine, that uses smartly the input combined in various ways. The report can be downloaded either in pdf or word format.
Free if you mind not clicking on several ads lying around the buttons ….